<!DOCTYPE html>
<html lang="zh">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="ie=edge">
	<title></title>
</head>
<body>
	<div id="dateTime"></div>
	    <script>
	        Date.prototype.format = function (fmt) {
	            var o = {
	                "y+": this.getFullYear(), //年
	                "M+": this.getMonth() + 1, //月份
	                "d+": this.getDate(), //日
	                "h+": this.getHours(), //小时
	                "m+": this.getMinutes(), //分
	                "s+": this.getSeconds() //秒
	            };
	            if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
	            for (var k in o)
	                if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
	            return fmt;
	        }
			document.getElementById('dateTime').innerHTML = new Date().format('yyyy-MM-dd hh:mm:ss');
	        setInterval("document.getElementById('dateTime').innerHTML = (new Date()).format('yyyy-MM-dd hh:mm:ss');", 1000);
	    </script>
	
	
</body>
</html>